Combined type-writing and computing machine.



E. C."ACHEL. I GOIIBINED TYPE WBHING MID COMPUTING MACHINE.

nrmcmon man 4101!. 1a. 1916.

1 1,259,379. I M11 11 Mar. 12,1918.

UNITED snares Parana orr'ron.

EMERSON G. EACHEL, F MGNTCLAZR, NEW JERSEY, ASSIGNOE T0 'U'NDERWOOD COM:- BUTING MACHINE CQMPANY, NEW" YURK, N. 521, A CQRPGEATION 035 NEW YDRK.

COMBIHEB TYPE-HTRZTEIG AND CQMP'UTING- MACHINE.

Application filed Eovember is. isle. Serial No.

To all whom it may concern:

Be 1t known that I, Emnnson C. Encimil,

a citizen of the United States, residing in Montclalr, m the county of Essex and State of New Jersey, have invented certain new .and useful Improvements in Combined Type-Vritin and Computing Machines, of which the to lowing is a specification.

. This invention relates to computing machines and particularly to those adapted to be used in combination with a typewriting machine. a

y In this type of machine, the dial wheels of the totalizer usually can be no wider than a letter-space of the typewriter which usually a tenth of an inch. For compactness and lightness, the dial is combined with the ear, and tomalre the numerals as wine arge as possible, the dial wheel has been made in the form of a ear having; large Wide teeth. The nuinera s are raised npon the periphery of these teeth.

In manufacturing these dial wheels,

Whosesize is limited, it isiinportant that the numeral shall sharply contrast with the background, so as to be easily read by the operator. The frame-work of the machine and the casing of the, totalizer are finished. in black, and the numerals are bright and contrasting when finished, so as to have a yellowish effect.

For this purpose, brass has been em loyed, and since brass tarnishes easily, the esired effect will not be permanent unless the poli'shed brass surface of the numeral is protected by some sort of coating, such as lacquer.

Since the numerals are arranged on the periphery of the gear teeth, which must mesh with the driver gear, and since the dial wheel is minute, it has been found commercially impracticable to coat these numerals with a protecting substance, such as lacquer, which quickly wears off in the meshing of the gears.

The present invention provides a dial gear having numerals of the necessary rightness and contrasting color, without the disadvantage of the wearing oil olthe lacquer.

This is accomplished, first, by plating the periphery of the dial wheel, including; the numerals thereon, with gold. Next the entire periphery of the dial wheels may he finished with a dark enamel, preferably Specification of Letters Patent.

black. The enamel is then hardened, and finally, the enamel is removed from the top. surface of the numerals.

Other features and advantages will hereinafter appear.

in the accompanying drawings,

Figure l is aside elevation of a part of a combined typewriting and computing machine, showing the dial wheel and its' connections to the driver. 7 r

2 is a fragmentary side elevation showing on a larfle scale part of the dial wheel and part or the totaliZer-fraine, including the sight-opening. v

Fig. is a perspective View of the dial wheel.

i is a front elevation showing the ap pearance oi the wheels through the sightopening' 01 the totalizer.

in combined tiypewriting and computing machine, the Underwood Addendw graph type, the tyepwriter carriage 10 is supported at its forward end upon a rail 11, and moves in letter-feed direction as the type keys are depressed. The typewriter carriage is provided with an arm 12 connected to a totalizer 13 by means of an arm 9. The totalizer 13 may be provided withrollers Li and 15 riding in tracks 16 and 17, in a supporting rail 18 secured to the front of the machine. The totalizer, being connected to the typewriter carriage-travels step by step as the keys are depressed to compute and print. As the carriage feeds, the totalizer is moved past a master Wheel 19, journaled in the frame of the machine.

Driven by the depression of the keys, the master wheel drives each'of a series of computing wheels 20 when in cooperation therewith. These computing wheels 20 are -journalcd on a shaft mounted in the side plates 21 and 22 ot' the totalizer and in permanent engagement with a series of dial wheels 23 journaled on a shaft also mounted in the side plates of the totalizer. The dial wheels 23 are usually provided with numerals arery of the gear'teeth of the dial wheel, including the numerals thereon, with an electro-plating of gold 26, of a suitable quality, gold or gold alloy, that is not liable to tarnish. The entire periphery of the dial is then coated with an enamel 27. This enamel is preferably black for contrast and legibility. The enamel is finally removed from the surface of the numerals. This may be done by a brush or any suitable means. It is advantageous to have the numerals raised from the periphery of the teeth, thus facilitating the removal of thernamel from the surface of the teeth.

It will be seen that a dial wheel manufactured as above will have all the advantage of a long-wearing steel wheel (as com- V pared with a rapidly wearing brass wheel),

while a legibility is secured that would not be possible with a steel wheel (steel wheels having been in common use for many years,

and beingthe best form of wheel known prior to my invention), and such legibility 18 permanent and Secured at low cost.

Variations may be resorted to within the scope of the invention, and portions of the im rovements may be used without others. aving thus described my invention, I claim:

1,. A totalizer dial wheel having raised numbers thereon and formed of wear-resisting metal of dull color and having its numbored face gold plated and coated with dark i'naterial which is removed from the raised surfaces of the gold plated numbers.

2. A totalizer dial wheel consisting of a gear upon the tips of whose teeth are raised numbers, said wheel formed of wear-resisting dull metal and having the numbered tips of 'said teeth gold plated and coated with contrasting material which is removed only sufficiently to expose the raised surfaces ot' the gold plated numbers.

3. A totalizer dial wheel having raised numbers thereon and formed of wear-resisting dull metal, and having the outlines of the numbers plated with gold and exposed upon, a background of dull contrasting material applied upon said wheel.

4. A totalizer dial wheel formed of wearresisting dull metal having gear teeth and having raised numerals arranged on the periphery of the gear teeth, said numerals being provided with a plating of gold and having a background of'dark material applied upon the wheel.

' EMERSON C. EACHEL.

Witnesses:

Jmmm P. THOBNE, ARTHUR A. JOHNSON. 

